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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
Main LCD control signals are generated by MSM7200A. Those signal’s path are :
MSM7200A
Æ
24-pin LCD connector -> LCD Module
4.13 Main LCD trouble
The LCD works
START
Press Power on key
to turn the power on
Is the circuit powered?
Follow the Power ON
trouble shooting
LCD display OK?
Check
VREG_LCD_2.8V, VREG_MSME_1.8V
LCD_RESET_N in
Main BD
No
Yes
Yes
No
Disconnect and reconnect
24-pin Main to LCD
connector
Change the Main BD
No
End
Yes
Display OK?
Yes
No
No
Change the LCD module